refactor: tidy structure of source files

Fixes #79

src/general/map.ts

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * Capsulation for a map with a string as key with values of type `T`
+ *
+ * !!! BEWARE !!!
+ * Can't be refactored to a `Map<K, V>`, because it can't be serialized via JSON.stringify(map)
+ *
+ * @typeparam T Can be any type.
+ */
+export interface SCMap<T> {
+  /**
+   * One value for each key
+   */
+  [key: string]: T;
+}
+
+/**
+ * Restricted map with keys, limited to values of `U`, and corresponding values of type `T`
+ *
+ * !!! BEWARE !!!
+ * Can't be refactored to a `Map<K, V>`, because it can't be serialized via JSON.stringify(map)
+ * Also note, that this is a type not an interface
+ *
+ * @typeparam U Must be a type the `in` operator can be applied to and contains only strings or numbers
+ * @typeparam T Can be any type
+ */
+export type SCRestrictedMap<U extends string | number, T> = {
+  /**
+   * One value for each key
+   */
+  [key in U]: T
+};